<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            min-width: 600px;
        }

        /*头部+尾部*/
        .header, .footer {
            width: 100%;
            height: 100px;
            line-height: 100px;
            background-color: #2fff99;
            text-align: center;
            font-size: 30px;
        }

        /*    主体*/
        .container {
            padding: 0 200px;
            overflow: hidden;
        }

        .column {
            float: left;
            min-height: 300px;
            position: relative;
        }

        .left {
            width: 200px;
            background-color: #f00;
            /*margin-left: -100%;*/
            /*left: -200px;*/
        }

        .center {
            width: 100%;
            background-color: blue;
        }

        .right {
            width: 200px;
            background-color: black;
            margin-left: -200px;
            right: -200px;
        }
    </style>
</head>
<body>

<!-- 一个网页通常由上中下本部分组成 -->
<!--1.header头部-->
<div class="header">#header</div>
<!--2.content主体内容区-->
<div class="container">
    <div class="column center"></div>
    <div class="column left"></div>
    <div class="column right"></div>
</div>
<!--3.footer尾部-->
<div class="footer">#footer</div>

</body>
</html>